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BID regulates AIF-mediated caspase-independent necroptosis by promoting BAX activation

L Cabon1, P Galán-Malo, A Bouharrour

  • 1INSERM U872, Mort Cellulaire Programmée et Physiopathologie des Cellules Tumorales, Equipe 19, Centre de Recherche des Cordeliers, Paris, France.

Cell Death and Differentiation
|July 9, 2011
PubMed

Insights

The protein BID is crucial for initiating necroptosis, a programmed cell death pathway, by linking calpain activation to BAX activation and subsequent cell death following DNA damage. This reveals BH3-only proteins as key regulators in caspase-independent necroptosis.

Area of Science:

  • Molecular Biology
  • Cell Death Pathways
  • Biochemistry

Background:

  • Alkylating DNA-damage agents like MNNG induce necroptosis, a programmed cell death (PCD) pathway regulated by RIP kinases.
  • This caspase-independent PCD involves PARP-1, calpains, BAX, and AIF, with BAX-mediated AIF release from mitochondria being critical.
  • The precise mechanism controlling BAX activation during MNNG-induced necroptosis remains unclear.

Purpose of the Study:

  • To elucidate the mechanism regulating BAX activation in N-methyl-N'-nitro-N'-nitrosoguanidine (MNNG)-induced necroptosis.
  • To identify the role of BID protein in the BAX-mediated AIF release pathway during necroptosis.
  • To understand the upstream regulators of BAX activation in this specific programmed cell death.

Main Methods:

  • Utilized mouse embryonic knockout cells lacking BID to investigate its role in necroptosis.
  • Analyzed BAX activation and cell death following MNNG treatment in wild-type versus BID-deficient cells.
  • Employed mutant BID proteins (BID-G70A, BID-Δ68-71) to assess the necessity of calpain-mediated processing for necroptosis induction.

Main Results:

  • Genetic ablation of BID completely abolished BAX activation and necroptosis in MNNG-treated cells, despite PARP-1 and calpain activation.
  • BID acts as a crucial link between calpain activation and BAX activation in this necroptosis pathway.
  • Calpain-dependent processing of BID into tBID is essential for its function in promoting BAX activation and mitochondrial localization, leading to necroptosis.

Conclusions:

  • BID is a critical regulator of BAX activation and subsequent necroptosis induced by DNA damage agents like MNNG.
  • The processing of BID by calpains is a necessary step for initiating the BAX-mediated mitochondrial pathway in necroptosis.
  • BH3-only proteins, exemplified by BID, are key regulators of caspase-independent necroptosis, mirroring their role in apoptosis.

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